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- W2793885008 abstract "We present an approximate model for the threading dislocations in III–V heterostructures and have applied this model to study the defect behavior in metamorphic triple-junction solar cells. This model represents a new approach in which the coefficient for second-order threading dislocation annihilation and coalescence reactions is considered to be determined by the length of misfit dislocations, LMD, in the structure, and we therefore refer to it as the LMD model. On the basis of this model we have compared the average threading dislocation densities in the active layers of triple junction solar cells using linearly-graded buffers of varying thicknesses as well as S-graded (complementary error function) buffers with varying thicknesses and standard deviation parameters. We have shown that the threading dislocation densities in the active regions of metamorphic tandem solar cells depend not only on the thicknesses of the buffer layers but on their compositional grading profiles. The use of S-graded buffer layers instead of linear buffers resulted in lower threading dislocation densities. Moreover, the threading dislocation densities depended strongly on the standard deviation parameters used in the S-graded buffers, with smaller values providing lower threading dislocation densities." @default.
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- W2793885008 date "2018-02-28" @default.
- W2793885008 modified "2023-09-27" @default.
- W2793885008 title "Model for threading dislocations in metamorphic tandem solar cells on GaAs (001) substrates" @default.
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- W2793885008 doi "https://doi.org/10.1088/2053-1591/aaac41" @default.
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